Influence of Crystallization Time for Synthesis of Zeolite A and Zeolite X from Natural Kaolin

Abstract:

Zeolite A and zeolite X was successfully synthesized from natural kaolin from Lampang province using calcination and two-step method of hydrothermal under the optimum conditions. Firstly, metakaolin was achieved by calcining the kaolin at 700 °C for 2 h. Secondly, hydrothermal experiments can be separated into two steps, the high temperature and short time of hydrothermal, metakaolin was mixed with NaOH to form hydrous sodium aluminosilicate, which was dissolved in dilute HCl. After the filtration, adjusted with deionized water to pH = 7 to form an amorphous aluminosilicate gel. Low temperature and longtime of hydrothermal, aluminosilicate gel was mixed with NaOH to form zeolite A and zeolite X. The optimum conditions for synthesis zeolite A is the high temperature and short time of hydrothermal with NaOH 8 M at 200 °C for 3 h and low temperature and longtime of hydrothermal with NaOH 1 M at 90 °C for 72 h. The optimum conditions for synthesis zeolite X is the high temperature and short time of hydrothermal with NaOH 8 M at 200 °C for 3 h and low temperature and longtime hydrothermal was NaOH 1 M at 90 °C for 120 h. The characterization of zeolite A and zeolite X were examined by x-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (FT-IR). Keywords: Zeolite A, zeolite X, Kaolin, Hydrothermal, Kaolin

• Periodical: Key Engineering Materials (Volume 824)
• Pages: 231-235
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.824.231
• Online since: October 2019
• Authors: Suphada Srilai, Worapak Tanwongwal, Kobchai Onpecth, Thanapat Wongkitikun, Gasidit Panomsuwan, Masayoshi Fuji, Apiluck Eiad-Ua*
• Keywords: Hydrothermal, Kaolin, Zeolite A, Zeolite X

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